U.S. patent number 8,228,633 [Application Number 12/196,131] was granted by the patent office on 2012-07-24 for method and system for providing a magnetic recording transducer having a hybrid moment pole.
This patent grant is currently assigned to Western Digital (Fremont), LLC. Invention is credited to Zhigang Bai, Ut Tran.
United States Patent |
8,228,633 |
Tran , et al. |
July 24, 2012 |
Method and system for providing a magnetic recording transducer
having a hybrid moment pole
Abstract
A method and system provide a magnetic transducer that includes
an air-bearing surface (ABS). The magnetic transducer includes an
underlayer and a main pole residing on the underlayer. The main
pole includes a front and a rear. The front resides at the ABS,
while the rear is distal from the ABS. The main pole also includes
a first portion having a first magnetic moment and a second portion
having a second magnetic moment. The first portion has a front face
at the ABS and terminates between the ABS and the rear of the main
pole. A part of the second portion resides on the first portion,
while another part of the second portion resides between the first
portion of the main pole and the rear of the main pole. The first
magnetic moment is less than the second magnetic moment.
Inventors: |
Tran; Ut (San Jose, CA),
Bai; Zhigang (Milpitas, CA) |
Assignee: |
Western Digital (Fremont), LLC
(Fremont, CA)
|
Family
ID: |
46513075 |
Appl.
No.: |
12/196,131 |
Filed: |
August 21, 2008 |
Current U.S.
Class: |
360/125.07 |
Current CPC
Class: |
G11B
5/3116 (20130101); G11B 5/1278 (20130101); G11B
5/3163 (20130101) |
Current International
Class: |
G11B
5/23 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Blouin; Mark
Claims
We claim:
1. A magnetic transducer having an air-bearing surface (ABS)
comprising: an underlayer; a main pole residing on the underlayer
and having a front and a rear, the front at the ABS and the rear
distal from the ABS, the main pole also including a first portion
having a first magnetic moment and a second portion having a second
magnetic moment, the first portion having a front face at the ABS
and terminating between the ABS and the rear of the main pole, a
part of the second portion residing on the first portion, another
part of the second portion residing between the first portion of
the main pole and the rear of the main pole such that a line normal
to the ABS passing through the first portion also passes through
the other part of the second portion of the main pole, the first
magnetic moment being less than the second magnetic moment.
2. The magnetic transducer of claim 1 wherein first portion
terminates not more than two hundred nanometers from the ABS.
3. The magnetic transducer of claim 2 wherein the first portion
terminates at least fifty nanometers from the ABS.
4. The magnetic transducer of claim 1 wherein the first magnetic
moment is at least one and not more than two Tesla.
5. The magnetic transducer of claim 1 wherein the first portion
terminates at an angle of at least thirty and not more than one
hundred fifty degrees with the underlayer.
6. A magnetic transducer having an air-bearing surface (ABS)
comprising: an underlayer; a main pole residing on the underlayer
and having a front and a rear, the front at the ABS and the rear
distal from the ABS, the main pole also including a first portion
having a first magnetic moment and a second portion having a second
magnetic moment, the first portion having a front face at the ABS
and terminating between the ABS and the rear of the main pole, a
part of the second portion residing on the first portion, another
part of the second portion residing between the first portion of
the main pole and the rear of the main pole, the first magnetic
moment being less than the second magnetic moment; wherein the main
pole further includes at least a third portion residing on the
first portion and below the part of the second portion, the third
portion having at least a third magnetic moment not more than the
second magnetic moment, the at least the third portion having a
front at the ABS and terminating between the ABS and the rear of
the main pole.
7. The magnetic transducer of claim 6 wherein the at least the
third magnetic moment is less than the second magnetic moment and
greater than the first magnetic moment.
8. The magnetic transducer of claim 7 wherein the at least the
third portion further includes: a plurality of layers, each of the
plurality of layers having a magnetic moment greater than the
magnetic moment of a lower layer, a lowest layer of the plurality
of layers having a magnetic moment greater than the first magnetic
moment, and a top layer of the plurality of layers having magnetic
moment not more than the second magnetic moment.
9. The magnetic transducer of claim 7 wherein the main pole has a
thickness, the first portion and the at least the third portion
together having low moment thickness of not more than one-third of
the thickness.
10. The magnetic transducer of claim 1 wherein the second portion
includes at least one bevel.
11. A magnetic transducer having an air-bearing surface (ABS)
comprising: an underlayer; a main pole residing on the underlayer
and having a front and a rear, the front at the ABS and the rear
distal from the ABS, the main pole also including a first portion
and a second portion, the first portion including at least one
layer, each of the at least one layer having a magnetic moment
greater than the magnetic moment of a lower layer of the at least
one layer, the second portion having a second portion magnetic
moment, the first portion having a front face at the ABS and
terminating between the ABS and the rear of the main pole, a part
of the second portion residing on the first portion, another part
of the second portion residing between the first portion of the
main pole and the rear of the main pole such that a line normal to
the ABS passing through the first portion also passes through the
other part of the second portion of the main pole, the magnetic
moment of a top layer of the plurality of layers being at least one
Tesla and not more than 2 Tesla, the second moment being greater
than two Tesla, the first portion terminating at least fifty
nanometers and not more than two hundred nanometers from the
ABS.
12. A disk drive comprising: a slider; a magnetic transducer
coupled with the slider and having an air-bearing surface (ABS),
the magnetic transducer including an underlayer and a main pole
residing on the underlayer, the main pole having a front and a
rear, the front at the ABS and the rear distal from the ABS, the
main pole also including a first portion having a first magnetic
moment and a second portion having a second magnetic moment, the
first portion having a front face at the ABS and terminating
between the ABS and the rear of the main pole, a part of the second
portion residing on the first portion, another part of the second
portion residing between the first portion of the main pole and the
rear of the main pole such that a line normal to the ABS passing
through the first portion also passes through the other part of the
second portion of the main pole, the first magnetic moment being
less than the second magnetic moment.
Description
BACKGROUND
FIG. 1 depicts air-bearing surface (ABS) and side views of a
conventional main pole 10 for a conventional magnetic recording
head. The conventional magnetic recording head may be a
perpendicular magnetic recording (PMR) head. The conventional
magnetic recording head typically includes a conventional read
transducer (not shown) and a conventional write transducer (not
shown). The conventional main pole 10 includes sidewalls 12 at an
angle, .theta., from vertical. For the conventional main pole 10 to
be used, the angle, .theta., is greater than zero degrees. For
example, angles in the range of eight to nine degrees may be used.
The width, w, of the main pole corresponds to the track width of
the conventional main pole 10. The conventional main pole 10
includes a high moment material, such as CoFe having a moment of
two Tesla or higher.
Although the conventional main pole 10 functions, the trend in
magnetic recording heads is to higher recording densities and,
therefore, lower widths. As the width of the conventional main pole
10 is reduced, the bottom of the conventional main pole 10 will
eventually reduce in size, ending in a point. Such a conventional
main pole 10 may be difficult to fabricate.
FIG. 2 depicts ABS and side views of another conventional main pole
10' for a conventional magnetic recording head. The conventional
magnetic recording head may be a PMR head. The conventional
magnetic recording head typically includes a conventional read
transducer (not shown) and a conventional write transducer (not
shown). The conventional main pole 10' is analogous to the
conventional main pole 10' and thus includes sidewalls 12' at an
angle, .theta.', from vertical. The conventional main pole 10' also
includes a high moment portion 16 and a low moment portion 14. The
high moment portion 16 is analogous to the main pole 10, and thus
may have a moment of greater than two Tesla. The low moment portion
14 has a moment less than two Tesla.
Because of the inclusion of the low moment portion 14, the
conventional main pole 10' may have a smaller angle, .theta.'.
Stated differently, the conventional main pole 10' may have a
smaller physical angle 8' and thus a wider bottom than the
conventional main pole 10 for the same width, w. As a result, the
conventional main pole 10' may be easier to fabricate than the
conventional main pole 10 at lower widths, w.
Although the conventional main pole 10' may be easier to fabricate
at higher recording densities, writeability may suffer. The
conventional main pole 10' may be unable to deliver as high a
magnetic field as desired to write to smaller tracks. Consequently,
even though such a conventional pole 10' may be produced, the
magnetic recording heads using such poles 10' may not function as
desired.
Accordingly, what is needed is a system and method for improving
the performance of a magnetic recording head at higher recording
densities.
BRIEF SUMMARY OF THE INVENTION
A method and system provide a magnetic transducer that includes an
air-bearing surface (ABS). The magnetic transducer includes an
underlayer and a main pole residing on the underlayer. The main
pole includes a front and a rear. The front resides at the ABS,
while the rear is distal from the ABS. The main pole also includes
a first portion having a first magnetic moment and a second portion
having a second magnetic moment. The first portion has a front face
at the ABS and terminates between the ABS and the rear of the main
pole. A part of the second portion resides on the first portion,
while another part of the second portion resides between the first
portion of the main pole and the rear of the main pole. The first
magnetic moment is less than the second magnetic moment.
BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS
FIG. 1 depicts air-bearing surface and side views of a conventional
magnetic recording head.
FIG. 2 depicts air-bearing surface and side views of another
conventional magnetic recording head.
FIG. 3 depicts a side view of an exemplary embodiment of a magnetic
recording head.
FIG. 4 depicts air-bearing surface and side views of an exemplary
embodiment of a main pole.
FIG. 5 depicts air-bearing surface and side views of another
exemplary embodiment of a main pole.
FIG. 6 depicts air-bearing surface and side views of another
exemplary embodiment of a main pole.
FIG. 7 depicts air-bearing surface and side views of another
exemplary embodiment of a main pole.
FIG. 8 depicts air-bearing surface and side views of another
exemplary embodiment of a main pole.
FIG. 9 is a flow chart depicting an exemplary embodiment of a
method for providing a magnetic recording transducer.
FIG. 10 is a flow chart depicting an exemplary embodiment of a
method for providing a magnetic recording transducer.
FIGS. 11-15 depict an exemplary embodiment of a magnetic recording
transducer during fabrication.
FIG. 16 is a flow chart depicting an exemplary embodiment of a
method for providing a magnetic recording transducer.
FIGS. 17-23 depict exemplary embodiments of a magnetic recording
transducer during fabrication.
FIG. 24 is a flow chart depicting an exemplary embodiment of a
method for providing a magnetic recording transducer.
FIGS. 25-29 depict exemplary embodiments of a magnetic recording
transducer during fabrication.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 3 depicts a side view of an exemplary embodiment of a magnetic
recording head 100. For clarity, FIG. 3 is not drawn to scale. In
addition, seed and/or capping layers are not shown. The magnetic
recording head 100 may reside on a slider and be part of a disk
drive. The magnetic recording head 100 shown is a merged head
including a read transducer 102 and a write transducer 110. In
another embodiment, the magnetic head 100 may include only the
magnetic transducer 110. The read transducer 102 includes first and
second shields 104 and 108 as well as a read sensor 106 between the
shields 104 and 108. The magnetic transducer 110 shown is a PMR
transducer and includes a first pole 112, coils 114 and 119, write
gap 116, return shield 118, and main pole 120. The main pole 120
resides on an underlayer 115. In another embodiment, portions of
the magnetic transducer 110 may be omitted. For example, a single
coil 114 or 119 may be used. Similarly, the return shield 118 might
be omitted. Features of the main pole 120 are further depicted in
FIG. 4.
FIG. 4 depicts air-bearing surface and side views of an exemplary
embodiment of a main pole 120. For clarity, FIG. 4 is not drawn to
scale. For simplicity, seed and/or capping layers are not shown.
Also shown in FIG. 4 is nonmagnetic underlayer 115, which may
include materials such as aluminum oxide.
The main pole 120 includes sidewalls 122, a front 128 substantially
at the ABS and terminates at a rear 129 distal from the ABS. In one
embodiment, the rear 129 is approximately four micrometers from the
ABS. However, in other embodiments, the rear 129 of the main pole
120 may terminate a different distance from the ABS. The sidewalls
122 of the main pole 120 are undercut, making a physical angle,
(I), with normal to the surface. Although shown as planar surfaces,
in another embodiment, the sidewalls 122 may have another
shape.
The main pole also includes a first, low moment portion 124 and a
second, high moment portion 126. In one embodiment, the low moment
portion 124 has a height, h.sub.1, that is not more than one-half
of the height of the high moment portion 126, h.sub.2. The moment
of the low moment portion 124 is less than the moment of the high
moment portion 126. In one embodiment, the high moment portion 126
has a moment greater than two Tesla. In one embodiment, both parts
126A and 126B of the high moment portion 126 have the same moment
and/or may be made of the same material. For example, both parts
126A and 126B may include materials such as CoFe having a moment of
2.45 T. However, in another embodiment, the portions 126A and 126B
of the high moment portion 126 may have different moments. The part
126A of the high moment portion 126 may have a higher moment and
may include materials such as CoFe. The part 126B of the high
moment portion 126 may have an intermediate moment above that of
the low moment portion 124, but less than that of the high moment
part 126A. For example, the high moment portion 126B may be
laminated with layers characterized by interactions such as
ferromagnetic, magnetostatic, or antiferromagnetic coupling. For
example, bilayer(s) of materials such as CoFe/NiFe,
CoFe/Al.sub.2O.sub.3, or CoFe/Ru may be used for the high moment
part 126B.
In contrast, the low moment portion 124 has a moment less than the
either of the parts 126A and 126B of the high moment portion 126.
In one embodiment, the low moment portion 124 has a moment of at
least one and not more than two Tesla. In addition to having a
lower moment than the high moment portion 126, the low moment
portion 124 terminates between the ABS and the rear 129 of the main
pole 120. For example, in one embodiment, the low moment portion
124 terminates not more than two hundred nanometers from the ABS.
In one such embodiment, the low moment portion 124 terminates at
least fifty nanometers from the ABS. In another embodiment, the low
moment portion 124 may terminate not less than twenty nanometers
from the ABS. In the embodiment shown, the low moment portion 124
terminates at a back surface forming an angle, .alpha., with a line
parallel to the underlayer 115. The angle, .alpha., my take on
various values in different embodiments. In one embodiment, .alpha.
may be ninety degrees. However, in other embodiments, .alpha. may
range from at least thirty to not more than one hundred fifty
degrees with the underlayer 115.
Use of the low moment portion 124 allows the physical angle, .phi.,
for the sidewalls 122 to be made smaller. For example, in one
embodiment, the physical angle .phi. is not more than five degrees.
In one such embodiment, the physical angle .phi. is at least two
degrees. This lower physical angle .phi. may be achieved while
maintaining the desired field contours because the field provided
by the low moment portion 124 is reduced. Stated differently, a
lower physical sidewall angle .phi. may be achieved while
maintaining a higher effective "magnetic sidewall angle". As a
result, the main pole 120 may be manufactured at lower track
widths. In addition, because the high moment portion 126B has a
higher moment, the magnitude of the field provided by the main pole
120 may be maintained at a sufficient level. Consequently, field
strength may not be adversely affected. As a result, the main pole
120 may still have sufficient field strength to write to the media
(not shown). Consequently, the head 100 may be fabricated and have
the desired performance for higher density recording.
FIG. 5 depicts air-bearing surface and side views of another
exemplary embodiment of a main pole 120' that may be used in the
magnetic recording transducer 110 of the head 100. For clarity,
FIG. 5 is not drawn to scale. For simplicity, seed and/or capping
layers are not shown. Also shown in FIG. 5 is nonmagnetic
underlayer 115', which may include materials such as aluminum
oxide. Portions of the main pole 120' are analogous to the main
pole 120. Consequently, analogous portions of the main pole 120'
are labeled similar to the main pole 120. The main pole thus
includes sidewalls 122' having angles .phi.', front 128', rear
129', high moment portion 126' and low moment portion 124'. The
high moment portion 126' is analogous to the high moment portion
126 and thus includes parts 126A' and 126B'.
In one embodiment, the low moment portion 124' has a height,
h.sub.1, that is not more than one-half of the height of the high
moment portion 126', h.sub.2. The moment of the low moment portion
124' is less than the moment of the high moment portion 126'. The
high moment portion 126' has a moment greater than two Tesla. In
one embodiment, both parts 126A' and 126B' of the high moment
portion 126 have the same moment and/or may be made of the same
material. For example, both parts 126A' and 126B' may include
materials such as CoFe having a moment of 2.45 T. However, in
another embodiment, the portions 126A' and 126B' of the high moment
portion 126' may have different moments. The part 126A' of the high
moment portion 126' may have a higher moment and may include
materials such as CoFe. The part 126B' may have an intermediate
moment above that of the low moment portion 124', but less than
that of the high moment portion 126A'. For example, the high moment
part 126B' may be laminated in an analogous manner to the part
126B, discussed above.
In contrast, the low moment portion 124' has a moment less than the
either of the parts 126A' and 126B' of the high moment portion
126'. In the embodiment shown, the low moment portion 124' has
parts 124A and 124B. Both parts 124A and 124B have lower moment
than either part 126A' and 126B' of the high moment portion 126'.
In one embodiment, both parts 124A and 124B have moments of at
least one and not more than two Tesla. In one embodiment, the parts
124A and 124B have different moments. The lower part 124A that is
closer to the underlayer may have a moment that is less than the
moment of the upper part 124B. The upper part 124B has a lower
moment than either of the parts 126A' and 126B'. Further, although
shown as having the same thickness, the parts 124A and 124B may
have different thicknesses.
In addition to having lower moment(s) than the high moment portion
126', the low moment portion 124' terminates between the ABS and
the rear 129' of the main pole 120'. For example, in one
embodiment, the low moment portion 124' terminates not more than
two hundred nanometers from the ABS. In one such embodiment, the
low moment portion 124' terminates at least fifty nanometers from
the ABS. In another embodiment, the low moment portion 124' may
terminate not less than twenty nanometers from the ABS. In the
embodiment shown, the low moment portion 124' terminates at a back
surface forming an angle, .alpha.', with a line parallel to the
underlayer 115'. The angle, .alpha.', my take on various values in
different embodiments. In one embodiment, .alpha.' may be ninety
degrees. However, in other embodiments, .alpha.' may range from at
least thirty to not more than one hundred fifty degrees with the
underlayer 115'.
Use of the low moment portion 124' allows the main pole 120' to
share substantially the same benefits as the magnetic pole 120.
Further, the moments of the parts 124A and 124B may be further
tailored to achieve the desired performance of the magnetic head
100. Consequently, performance may be improved.
Although only two parts 124A and 124B are shown for the low moment
portion 124', more layers could be provided. For example, FIG. 6
depicts air-bearing surface and side views of another exemplary
embodiment of a main pole 120'' that may be used in the magnetic
recording transducer 110 of the head 100. For clarity, FIG. 6 is
not drawn to scale. For simplicity, seed and/or capping layers are
not shown. Also shown in FIG. 6 is nonmagnetic underlayer 115'',
which may include materials such as aluminum oxide. Portions of the
main pole 120'' are analogous to the main poles 120 and 120'.
Consequently, analogous portions of the main pole 120' are labeled
similar to the main pole 120/120'. The main pole thus includes
sidewalls 122'' having angles .phi.'', front 128'', rear 129'',
high moment portion 126'' and low moment portion 124''. The high
moment portion 126'' is analogous to the high moment portion
126/126' and thus includes parts 126A'' and 126B''.
In one embodiment, the low moment portion 124'' has a height,
h.sub.1, that is not more than one-half of the height of the high
moment portion 126'', h.sub.2. The moment of the low moment portion
124'' is less than the moment of the high moment portion 126''. The
moments and structures of the parts 126A'' and 126B'' are analogous
to the parts 126A/126A' and 126B/126B'.
The low moment portion 124'' is analogous to the low moment
portions 124/124' and thus has a moment less than the either of the
parts 126A'' and 126B'' of the high moment portion 126''. However,
the low moment portion 124'' has parts 124A', 124B', and 124C'. All
parts 124A', 124B' and 124C have lower moment than either part
126A'' and 126B'' of the high moment portion 126''. In one
embodiment, all parts 124A', 124B' and 124C have moments of at
least one and not more than two Tesla. In one embodiment, the parts
124A', 124B', and 124C have different moments. The lower part 124A'
that is closer to the underlayer may have a moment that is less
than the moment of the next part 124B'. The part 124B' has a lower
moment than that of the highest part 124C. The upper part 124C has
a lower moment than either of the parts 126A'' and 126B''. Although
shown as having the same thickness, the parts 124A', 124B', and
124C may have different thicknesses.
In addition to having lower moment(s) than the high moment portion
126'', the low moment portion 124'' terminates between the ABS and
the rear 129'' of the main pole 120'' in a manner that is analogous
to the low moment portions 124 and 124'. For example, in one
embodiment, the low moment portion 124'' terminates not more than
two hundred nanometers and at least fifty nanometers from the ABS.
In another embodiment, the low moment portion 124'' may terminate
not less than twenty nanometers from the ABS. In the embodiment
shown, the low moment portion 124'' terminates at a back surface
forming an angle, .alpha.'', with a line parallel to the underlayer
115''. The angle, .alpha.'', my take on various values in different
embodiments. In one embodiment, .alpha.'' may range from at least
thirty to not more than one hundred fifty degrees with the
underlayer 115''.
Through the use of the low moment portion 124'', the main pole
120'' shares the benefits of the poles 120 and 120'. Consequently,
performance and manufacturability may be improved.
FIG. 7 depicts air-bearing surface and side views of another
exemplary embodiment of a main pole 150 that may be used in the
magnetic recording transducer 110 of the head 100. For clarity,
FIG. 7 is not drawn to scale and seed and/or capping layers are not
shown. Also shown in FIG. 7 is nonmagnetic underlayer 145, which
may include materials such as aluminum oxide and corresponds to the
underlayer 115/115'/115''. Portions of the main pole 150 are
analogous to the main pole 120/120'/120''. Consequently, analogous
portions of the main pole 150 are labeled similar to the main pole
120/120'/120''. These are labeled similarly. The main pole 150 thus
includes sidewalls 152 having angle .beta., front 158, rear 159,
high moment portion 156 and low moment portion 154 having angle
.gamma. that correspond to sidewalls 122/122'/122'' having angle
.phi., front 128/128'/128'', rear 129/129'/129'', high moment
portion 126/126'/126'' and low moment portion 124/124'/124'' having
angle .alpha./.alpha.'/.alpha.'', respectively. Thus, the low
moment portion 154 may include one or more layers of material
having varying moments lower than the moment(s) of the high moment
portion 156. Consequently, the main pole 150 shares substantially
the same benefits as the magnetic poles 120/120'/120''. Further,
the main pole 150 includes a bevel 160.
FIG. 8 depicts air-bearing surface and side views of another
exemplary embodiment of a main pole 150' that may be used in the
magnetic recording transducer 110 of the head 100. For clarity,
FIG. 8 is not drawn to scale and seed and/or capping layers are not
shown. Also shown in FIG. 8 is nonmagnetic underlayer 145', which
may include materials such as aluminum oxide and corresponds to the
underlayer 115/115'/115''. Portions of the main pole 150' are
analogous to the main pole 120/120'/120'' and 150. Consequently,
analogous portions of the main pole 150' are labeled similar to the
main pole 120/120'/120''. These are labeled similarly. The main
pole 150' thus includes sidewalls 152' having angle .beta.', front
158', rear 159', high moment portion 156' and low moment portion
154' having angle .gamma.' that correspond to sidewalls
122/122'/122'' having angle .phi./.phi.'/.phi.'' front
128/128'/128'', rear 129/129'/129'', high moment portion
126/126'/126'' and low moment portion 124/124'/124'' having angle
.alpha./.alpha.'/.alpha.'', respectively. Thus, the low moment
portion 154' may include one or more layers of material having
varying moments lower than the moment(s) of the high moment portion
156'. Consequently, the main pole 150' shares substantially the
same benefits as the magnetic poles 120/120'/120'' and 150.
Further, the main pole 150' includes a bevel 160'. In addition,
although not shown, the main pole 150' might include a bottom bevel
analogous to the bevel 160. Thus, top and/or bottom levels could be
provided.
FIG. 9 is a flow chart depicting an exemplary embodiment of a
method 200 for providing a magnetic recording transducer. For
simplicity, some steps may be omitted. The method 200 is described
in the context of the magnetic transducer 100. The method 200 is
also described in the context of providing a single recording
transducer. However, the method 200 may be used to fabricate
multiple transducers at substantially the same time. The method 200
is also described in the context of particular layers. A particular
layer may include multiple materials and/or multiple sublayers. The
method 200 also may start after formation of other portions of the
magnetic recording transducer.
The underlayer 115 is provided, via step 202. In one embodiment,
step 202 includes depositing an aluminum oxide layer. The low
moment portion 124 of the main pole 120 is provided, via step 204.
Step 204 may include providing seed layer(s), blanket depositing
the lower moment material(s) for the portion 126, then removing a
portion of the lower moment material(s) distal from the ABS. In one
embodiment, step 204 may include depositing multiple layers of
different magnetic moments. In such an embodiment, the main poles
120', 120'', 150, and/or 150' may be provided.
The high moment portion 126 of the main pole 120 may also be
provided, via step 206. Step 206 may include refilling the part
126B distal from the ABS, then depositing the part 126A.
Fabrication of the main pole 120, as well as the magnetic
transducer 110 and magnetic head 100 may then be completed. For
example, a pole trim, write gap 116, return shield 118, lapping to
the ABS, other structures and/or other processes may be provided.
Thus, the main pole 120 may be provided by steps 204 and 206. Thus,
using the method 200, the transducer 110, write head 100, and main
pole 120/120'/120''/150/150' may be provided.
FIG. 10 is a flow chart depicting an exemplary embodiment of a
method 210 for providing a magnetic recording transducer. For
simplicity, some steps may be omitted. FIGS. 11-15 depict an
exemplary embodiment of a magnetic recording transducer during
fabrication. The recording transducer is analogous to the recording
transducer 110. For simplicity, only the main pole 250 and
underlayer 245 of the recording transducer are shown in FIGS.
11-15. Referring to FIGS. 10-15, the method 200 is described in the
context of the main pole 250. The method 210 is also described in
the context of providing a single recording transducer. However,
the method 210 may be used to fabricate multiple transducers at
substantially the same time. The method 210 is also described in
the context of particular layers. A particular layer may include
multiple materials and/or multiple sublayers. The method 210 also
may start after formation of other portions of the magnetic
recording transducer. For simplicity, only the underlayer 245 and
main pole 250 are shown. Further, any seed and capping layers are
omitted. In addition, note that FIGS. 11-15 are not drawn to
scale.
The underlayer 245 is provided, via step 212. In one embodiment,
step 212 includes depositing an aluminum oxide layer. The materials
for low moment portion of the main pole 250 are provided, via step
214. Step 214 may include providing seed layer(s) and blanket
depositing the lower moment material(s). These lower moment
materials may have a moment of at least one and not more than two
Tesla. In one embodiment, step 214 may include depositing multiple
layers of different magnetic moments. In such an embodiment, the
main pole 250 is analogous to the main poles 120', 120'', 150,
and/or 150'. FIG. 11 depicts the main pole 250 after step 214 is
performed. Thus, low moment material(s) 252 are shown on the
underlayer 245.
A portion of the low moment material(s) 252 distal from where the
ABS will be formed is removed, via step 216. Step 216 may include
forming a mask covering a portion of the low moment material(s)
252, then milling the low moment materials(s). FIG. 12 depicts the
main pole 250 after step 216 is performed. Thus, a mask 254 and
remaining portion of the low moment material(s) 252' are shown. The
back of the low moment material(s) 252' form an angle, .alpha.,
with the surface of the layers 245 and 252'.
The main pole 250 is refilled with high moment material(s), via
step 218. Step 218 may include depositing an alloy or forming a
multilayer. The materials provided in step 218 have a moment of at
least two Tesla. In one embodiment, step 218 includes removing the
mask 254 after deposition of the high moment material(s). FIG. 13
depicts the main pole 250 after step 218. Thus, the high moment
material(s) 256 are shown.
Additional high moment material(s) are also provided, via step 220.
In one embodiment, in which the same materials are provided, step
220 and 218 may be merged. FIG. 14 depicts the main pole 250 after
step 220 is performed. Thus, high moment material(s) 258 are
shown.
Fabrication of the main pole 250, as well as the magnetic
transducer 110 and magnetic head 100 may then be completed, via
step 222. For example, a pole trim, write gap, return shield,
lapping to the ABS, other structures and/or other processes may be
provided. FIG. 15 depicts the main pole 250 after step 222 is
performed. Thus, the main pole 250 has been lapped to the ABS. As a
result, the low moment portion 252'' remains. The parts 256 and
258' form a high moment portion 260 analogous to the portions 126,
126', 126'', 156, and 156'. Thus, using the method 210, the
transducer 110, write head 100, and main pole 250 that is analogous
to poles 120/120'/120''/150/150' may be provided.
FIG. 16 is a flow chart depicting an exemplary embodiment of a
method 310 for providing a magnetic recording transducer including
a main pole such as the main pole 150. For simplicity, some steps
may be omitted. FIGS. 17-23 depict exemplary embodiments of a
magnetic recording transducer during fabrication. The recording
transducer is analogous to the recording transducer 110. Referring
to FIGS. 16-23, the method 310 is described in the context of the
main pole 350. The method 310 is also described in the context of
providing a single recording transducer. However, the method 310
may be used to fabricate multiple transducers at substantially the
same time. The method 310 is also described in the context of
particular layers. A particular layer may include multiple
materials and/or multiple sublayers. The method 310 also may start
after formation of other portions of the magnetic recording
transducer. For simplicity, only the underlayer 345 and main pole
350 are shown. Further, any seed and capping layers are omitted. In
addition, note that FIGS. 17-23 are not drawn to scale.
The underlayer is provided, via step 312. In one embodiment, step
312 includes depositing an aluminum oxide layer. The materials for
low moment portion of the main pole 350 are provided, via step 314.
Step 314 may include providing seed layer(s) and blanket depositing
the lower moment material(s). These lower moment materials may have
a moment of at least one and not more than two Tesla. In one
embodiment, step 314 may include depositing multiple layers of
different magnetic moments. In such an embodiment, the main pole
350 is analogous to the main poles 120', 120'', 150, and/or 150'.
Because the main pole 350 would appear analogous to the main pole
250 after step 312, the main pole 350 is not shown.
A portion of the low moment material(s) distal from where the ABS
will be formed is removed, via step 316. Step 316 may include
forming a mask covering a portion of the low moment material(s),
then milling the low moment material(s). In addition, a portion of
the underlayer distal from the ABS may optionally be removed in
step 316. If a portion of the underlayer is removed, then a bottom
bevel is provided for the main pole 350. FIG. 17 depicts the main
pole 350 after step 316 is performed. In the embodiment shown, a
portion of the underlayer has been removed. Thus, remaining portion
of the underlayer 345 is shown. Also shown is a remaining portion
of the low moment materials 352 and mask 354. The back of the low
moment material(s) 352 form an angle, .alpha., with the surface of
the layers 345 and 352.
The main pole 350 is refilled with high moment material(s), via
step 318. Step 318 may include depositing an alloy or forming a
multilayer. The materials provided in step 318 have a moment of at
least two Tesla. In one embodiment, step 318 includes removing the
mask 354 after deposition of the high moment material(s). FIG. 18
depicts the main pole 350 after step 318. Thus, the high moment
material(s) 356 are shown.
Additional high moment material(s) are also provided, via step 320.
In one embodiment, in which the same materials are provided, step
320 and 318 may be merged. FIG. 19 depicts the main pole 350 after
step 320 is performed. Thus, high moment material(s) 358 are
shown.
A portion of the high moment materials 358 adjacent to the ABS
location optionally may be removed, via step 322. In such an
embodiment, a top bevel is provided for the main pole 350. FIG. 20
depicts the main pole 350 in an embodiment in which step 322 is
carried out. Thus, a remaining portion of the high moment materials
358' is shown.
Fabrication of the main pole 350, as well as the magnetic
transducer 110 and magnetic head 100 may then be completed, via
step 324. For example, a pole trim, write gap, return shield,
lapping to the ABS, other structures and/or other processes may be
provided. FIGS. 21-23 depict various embodiments of the main pole
350, 350' and 350'' after step 324 is performed. Thus, the main
pole 350/350'/350'' has been lapped to the ABS. As a result, the
low moment portion 352'/352''/352'' remains. The parts
356/356'/356'' and 358''/358''/358''' form a high moment portion
360/360'/360'' analogous to the portions 126, 126', 126'', 156, and
156'. In the magnetic pole 350, portions of the underlayer and the
high moment material(s) 358 have been removed in step 316 and 322.
Thus bottom bevel 362 and top bevel 364 have been provided. In the
magnetic pole 350', only a portion of the underlayer has been
removed in step 316. Step 322 was, therefore, omitted. Thus, only a
bottom bevel 362' is shown. In the magnetic pole 350'', only a
portion of the high moment material(s) 358 was removed in step 322.
Thus, the portion of step 316 that would remove part of the
underlayer was omitted. Consequently, only top bevel 364' is
provided. Thus, using the method 310, the transducer 110, write
head 100, and main poles 350/350'/350'' that are analogous to poles
120/120'/120''/150/150'/250 may be provided.
FIG. 24 is a flow chart depicting an exemplary embodiment of a
method 410 for providing a magnetic recording transducer including
a main pole such as the main pole 150. The method 410 provides a
transducer having dual bevels. For simplicity, some steps may be
omitted. FIGS. 25-29 depict exemplary embodiments of a magnetic
recording transducer during fabrication. The recording transducer
is analogous to the recording transducer 110. Referring to FIGS.
24-29, the method 410 is described in the context of the main pole
450. The method 410 is also described in the context of providing a
single recording transducer. However, the method 410 may be used to
fabricate multiple transducers at substantially the same time. The
method 410 is also described in the context of particular layers. A
particular layer may include multiple materials and/or multiple
sublayers. The method 410 also may start after formation of other
portions of the magnetic recording transducer. For simplicity, only
the main pole 450 and underlayer 445 of the recording transducer
are shown in FIGS. 25-29. Further, any seed and capping layers are
omitted. In addition, note that FIGS. 25-29 are not drawn to
scale.
The underlayer 445 is provided, via step 412. In one embodiment,
step 412 includes depositing an aluminum oxide layer. The materials
for low moment portion of the main pole 450 are provided, via step
414. Step 414 may include providing seed layer(s) and blanket
depositing the lower moment material(s). These lower moment
materials may have a moment of at least one and not more than two
Tesla. In one embodiment, step 414 may include depositing multiple
layers of different magnetic moments. In such an embodiment, the
main pole 450 is analogous to the main poles 120', 120'', 150,
and/or 150'. FIG. 25 depicts the main pole 450 after step 412.
Thus, the underlayer 445 and low moment material(s) 452 are
shown.
A portion of the low moment material(s) 452 and the underlayer 445
distal from where the ABS will be formed is removed, via step 416.
Step 416 may include forming a mask covering a portion of the low
moment material(s), then milling the low moment material(s) 452 and
a portion of the underlayer 445 distal from the ABS. FIG. 26
depicts the main pole 450 after step 416 is performed. In the
embodiment shown, a portion of the underlayer has been removed.
Thus, remaining portion of the underlayer 445' is shown. Also shown
is a remaining portion of the low moment materials 452' and mask
454. The back of the low moment material(s) 452' form an angle,
.alpha., with horizontal.
The main pole 450 is refilled with high moment material(s) while
the mask 454 is in place, via step 418. Step 418 may include
depositing an alloy or forming a multilayer. The materials provided
in step 418 have a moment of at least two Tesla. Step 418 includes
removing the mask 454 after deposition of the high moment
material(s). FIG. 27 depicts the main pole 450 after step 418.
Thus, the high moment material(s) 456 are shown. Because of the way
in which the high moment material(s) are deposited, a portion of
the high moment material(s) 456 reside above the low moment
material(s) 452'
Additional high moment material(s) are also provided, via step 420.
In one embodiment, the same materials may be provided. FIG. 28
depicts the main pole 450 after step 420 is performed. Thus, high
moment material(s) 458 are shown.
Fabrication of the main pole 450, as well as the magnetic
transducer 110 and magnetic head 100 may then be completed, via
step 422. For example, a pole trim, write gap, return shield,
lapping to the ABS, other structures and/or other processes may be
provided. FIG. 29 depicts the main pole 450 after step 422 is
performed. Thus, the main pole 450 has been lapped to the ABS. As a
result, the low moment portion 452'' remains. The parts 456 and
458' form a high moment portion 460 analogous to the portions 126,
126', 126'', 156, 156', 360, 360', and 360''. Because of the
removal of a portion of the underlayer 445' and because of the
manner in which the high moment material(s) 456 are deposited, the
main pole 450 includes bottom bevel 462 and top bevel 464. Thus,
using the method 410, the transducer 110, write head 100, and main
pole 450 that is analogous to poles
120/120'/120''/150/150'/250/350/350'/350'' may be provided.
Consequently, the benefits of the poles
120/120'/120''/150/150'/250/350/350'/350'' may be achieved.
* * * * *